Info/Development


The RGA Barbell Weight Calculator is developed to compare athletes of different size, gender and age in the squat, bench press, deadlift, overhead press and bench row. These exercises were selected for several reasons, but mainly because they’re a great combination for overall strength.

Performance standards (1) within competitive and amateur strength athletics show a relationship between strength, gender and body weight. We assembled the results to allow for an overview of this relationship.

Strength Overview

 

The results were then compared to Wilks (2) where a lot of discrepancies were found. Wilks corresponds best with the equipped bench press, but for raw lifting the deviations are substantial when compared to actual powerlifting records. Due to this marked discrepancy, the RGA barbell weight curves could not use Wilks for more than a reference.

Secondly, Wilks doesn’t make any distinction between exercises. This is a damning flaw, since the relationship between strength development and body weight is not identical for all movements.

Thirdly, Wilks does not take into account, anatomical differences between male and female athletes. Gender has considerable influence on some movements.

After the RGA weight curves were individually defined for each exercise, formulas used for “one-rep max calculators” (e.g. Brzycki, Baechle etc.) were reviewed to get an idea of suitable RGA weight levels.

The below graphs shows how RGA’s barbell weights compare to powerlifting records, a linear growth factor and Wilks. Note that the powerlifting records are proportionally lowered to create a better overview.

(1) Powerlifting competitions etc.
(2) Wilks: Used to compare strength between athletes in powerlifting.

Squat, male:

grap-Squat-Male

Squat, female:

grap-Squat-Female

Low Rep weights for men and women:
Barbell weights for men and women

Update, 2018-01-03:

After just over three years of competition (2014-2017) we went through all results to see if there were any significant deviations or “flaws” in our system.

The first and most significant discrepancy was seen for older and very light lifters, where the two coefficients lowered the weights so much it basically removed “strength” from the equation altogether (especially when combining the two). The conclusion is that the age coefficient for repetitive strength performance on low weights are significantly lower than in power- and weightlifting and that the weight curves were too beneficial for extremely light lifters.

The second and last, but very important deviation was noticed when comparing the results of taller vs shorter competitors. Taller lifters that would get a higher 1RM score than much shorter lifters didn’t stand a fair chance when competing for reps. This fact together with the previous problems resulted in a few adjustments, including a height coefficient.

The updated calculator is available here: Barbell Challenge

In the same way we created the calculator for Barbell Challenge, we also made one for a what we call Weightlift Challenge. This discipline was launched for the first time December 3’rd 2017 at #fitnessfestivalen, in Stockholm, Sweden. Check out the rules and weights for WL Challenge here: Weightlift Challenge

References:

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